when using a Bleach pen or soft scrub with bleach, etc to "dishcarge" dye your fabric, please be sure to STOP the bleach action...if you do not do this important step, the chlorine continues to destroy the fabric fibers!!!!!
Get some anit-chlor in the pool section of walmart, lowe's etc...it only takes a tsp to a gallon of water.....NOTHING else will stop it..not even vinegar....